package demo4.mapper;

import demo4.pojo.User;
import demo4.util.IDBUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

/**
 *
 */
@Component
public class UserMapper implements IUserMapper{
    @Autowired
    private IDBUtil dbUtil;
    public int deleteByUsername(String username){
        try(Connection connection = dbUtil.getConnection();) {
            String sql = "DELETE FROM user " +
                         "WHERE username=?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,username);
            return ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }
    public List<User> selectAll(){
        List<User> users = new ArrayList<>();
        try(Connection connection = dbUtil.getConnection();) {
            Statement statement = connection.createStatement();
            String sql = "SELECT id,username,password,nickname,age " +
                         "FROM user ";
            ResultSet rs = statement.executeQuery(sql);
            while(rs.next()){
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                users.add(user);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return users;
    }
    public int insert(User user) {
        System.out.println("UserMapper:插入用户数据");
        try (Connection connection = dbUtil.getConnection();) {
            String sql = "INSERT INTO user(username,password,nickname,age) " +
                    "VALUES(?,?,?,?) ";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1, user.getUsername());
            ps.setString(2, user.getPassword());
            ps.setString(3, user.getNickname());
            ps.setInt(4, user.getAge());
            return ps.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }
    public User selectByUsername(String username){
        try(Connection connection = dbUtil.getConnection();) {
            String sql = "SELECT id,username,password,nickname,age " +
                         "FROM user " +
                         "WHERE username=?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,username);
            ResultSet rs = ps.executeQuery();
            if(rs.next()){
                User user = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                return user;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    public User selectByPassword(String password){
        try(Connection connection = dbUtil.getConnection();) {
            String sql = "SELECT id,username,password,nickname,age " +
                         "FROM user " +
                         "WHERE password=? ";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,password);
            ResultSet rs = ps.executeQuery();
            if (rs.next()){
                User user  = new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setNickname(rs.getString("nickname"));
                user.setAge(rs.getInt("age"));
                return user;
            }

        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
    public int update(User user){
        try(Connection connection = dbUtil.getConnection();) {
            String sql = "UPDATE user " +
                         "SET password=?,nickname=?,age=? " +
                         "WHERE username=?";
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setString(1,user.getPassword());
            ps.setString(2,user.getNickname());
            ps.setInt(3,user.getAge());
            ps.setString(4,user.getUsername());
            return ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }
}
